S60 3rd Edition SDK for Symbian OS Example Applications Guide

TextureContainer.cpp

/*
* ==============================================================================
*  Name        : TextureContainer.cpp
*  Part of     : OpenGLEx / Texture
*  Interface   : 
*  Description : 
*  Version     : 
*
*  Copyright (c) 2004-2006 Nokia Corporation.
*  This material, including documentation and any related 
*  computer programs, is protected by copyright controlled by 
*  Nokia Corporation.
* ==============================================================================
*/

// INCLUDE FILES
#include "TextureContainer.h"


// ================= MEMBER FUNCTIONS =======================

// ---------------------------------------------------------
// CTextureContainer::ConstructL(const TRect& aRect)
// EPOC two phased constructor
// EGL code, e.g., OpenGL ES context creation, surface 
// creation etc. are located here.
// ---------------------------------------------------------
//
void CTextureContainer::ConstructL(const TRect& /*aRect*/)
{
    iOpenGlInitialized = EFalse;
    CreateWindowL();

    SetExtentToWholeScreen();                // Take the whole screen into use
    ActivateL();

    iFrame = 0;                              // Frame counter

    EGLConfig Config;                        // Describes the format, type and 
                                             // size of the color buffers and
                                             // ancillary buffers for EGLSurface

    /* Get the display for drawing graphics*/
    iEglDisplay = eglGetDisplay( EGL_DEFAULT_DISPLAY );
    if( iEglDisplay == NULL )
    {
            _LIT(KEglGetDisplay,    "eglGetDisplay failed");
        User::Panic( KEglGetDisplay, 0 );
    }

    /* Initialize display */
    if( eglInitialize( iEglDisplay, NULL, NULL ) == EGL_FALSE )
    {
            _LIT(KEglInitialize,    "eglInitialize failed");
        User::Panic( KEglInitialize, 0 );
    }

    EGLConfig *configList = NULL;            // Pointer for EGLConfigs
    TInt numOfConfigs = 0; 
    TInt configSize   = 0;

    /* Get the number of possible EGLConfigs */
    if( eglGetConfigs( iEglDisplay, configList, configSize, &numOfConfigs ) == EGL_FALSE )
    {
            _LIT(KEglGetConfigs,    "eglGetconfigs failed");
        User::Panic( KEglGetConfigs, 0 );
    }

    configSize = numOfConfigs;

    /* Allocate memory for the configList */
    configList = (EGLConfig*) User::Alloc( sizeof(EGLConfig)*configSize );
    if( configList == NULL )
    {
            _LIT(KConfigAlloc,      "config alloc failed");
        User::Panic( KConfigAlloc, 0 );
    }

    /* Define properties for the wanted EGLSurface.
       To get the best possible performance, choose
       an EGLConfig with a buffersize matching
       the current window's display mode*/
    TDisplayMode DMode = Window().DisplayMode();
    TInt BufferSize = 0;

    switch(DMode)
    {
    case(EColor4K):
        BufferSize = 12;
        break;
    case(EColor64K):
        BufferSize = 16;
        break;
    case(EColor16M):
        BufferSize = 24;
        break;
    case(EColor16MU):
        BufferSize = 32;
        break;
    default:
        _LIT(KDModeError,       "unsupported displaymode");
        User::Panic( KDModeError, 0 );
        break;
    }

    const EGLint attrib_list[] =
        {
        EGL_BUFFER_SIZE,BufferSize,   
        EGL_DEPTH_SIZE,16,    
        EGL_NONE
        };

    /* Choose an EGLConfig that best matches to the properties in attrib_list */
    if( eglChooseConfig( iEglDisplay, attrib_list, configList, configSize, &numOfConfigs ) == EGL_FALSE )
    {
            _LIT(KEglChooseConfig,  "eglChooseConfig failed");
        User::Panic( KEglChooseConfig, 0 );
    }

    Config = configList[0];   // Choose the best EGLConfig. EGLConfigs 
                              // returned by eglChooseConfig are sorted so 
                              // that the best matching EGLConfig is first in
                              // the list.
    User::Free( configList ); // Free configList, not used anymore.

    /* Create a window where the graphics are blitted */
    iEglSurface = eglCreateWindowSurface( iEglDisplay, Config, &Window(), NULL );
    if( iEglSurface == NULL )
    {
            _LIT(KEglCreateWindow,  "eglCreateWindow failed");
        User::Panic( KEglCreateWindow, 0 );
    }

    /* Create a rendering context */
    iEglContext = eglCreateContext( iEglDisplay, Config, EGL_NO_CONTEXT, NULL );
    if( iEglContext == NULL )
    {
            _LIT(KEglCreateContext, "eglCreateContext failed");
        User::Panic( KEglCreateContext, 0 );
    }

    /* Make the context current. Binds context to the current rendering thread
       and surface.*/
    if( eglMakeCurrent( iEglDisplay, iEglSurface, iEglSurface, iEglContext ) == EGL_FALSE )
    {
            _LIT(KEglMakeCurrent,   "eglMakeCurrent failed");
        User::Panic( KEglMakeCurrent, 0 );
    }
    
    TSize size;
    size = this->Size();

    iTexture = CTexture::NewL( size.iWidth, size.iHeight );
    iTexture->AppInitL();

    iOpenGlInitialized = ETrue;
    
    iPeriodic = CPeriodic::NewL( CActive::EPriorityIdle ); // Create an active object for
                                                           // animating the scene
                                                           
    iPeriodic->Start( 100, 100, TCallBack( CTextureContainer::DrawCallBack, this ) );
}

// Destructor
CTextureContainer::~CTextureContainer()
{
    delete iPeriodic;

    /* AppExit call is made to release any allocations made in AppInit. 
     This call has to be made here before we destroy the rendering context. */
    if ( !(iTexture == NULL) )
        {
        iTexture->AppExit();
        delete iTexture;
        }

    eglMakeCurrent( iEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT );
    eglDestroySurface( iEglDisplay, iEglSurface ); 
    eglDestroyContext( iEglDisplay, iEglContext );
    eglTerminate( iEglDisplay );                   // Release resources associated
                                                   // with EGL and OpenGL ES
}

// ---------------------------------------------------------
// CTextureContainer::SizeChanged()
// Called by framework when the view size is changed
// ---------------------------------------------------------
//
void CTextureContainer::SizeChanged()
    {
    if( iOpenGlInitialized && iTexture )
        {
        TSize size;
        size = this->Size();
        
        iTexture->SetScreenSize( size.iWidth, size.iHeight );
        }
    }


// ---------------------------------------------------------
// CTextureContainer::HandleResourceChange(
//     TInt aType)
// Dynamic screen resize changes by calling the
// SetExtentToWholeScreen() method again.
// ---------------------------------------------------------
//
 void CTextureContainer::HandleResourceChange(TInt aType)
    {
        switch( aType )
        {
            case KEikDynamicLayoutVariantSwitch:
                    SetExtentToWholeScreen();
                    break;
            }
    }

// ---------------------------------------------------------
// CTextureContainer::CountComponentControls() const
// ---------------------------------------------------------
//
TInt CTextureContainer::CountComponentControls() const
{
    return 0;
}

// ---------------------------------------------------------
// CTextureContainer::ComponentControl(TInt aIndex) const
// ---------------------------------------------------------
//
CCoeControl* CTextureContainer::ComponentControl(TInt /*aIndex*/) const
{
    return NULL;
}

// ---------------------------------------------------------
// CTextureContainer::Draw(const TRect& aRect) const
// ---------------------------------------------------------
//
void CTextureContainer::Draw(const TRect& /*aRect*/ ) const
{
    // Nothing to do here...
}

// ---------------------------------------------------------
// CTextureContainer::DrawCallBack( TAny* aInstance )
// Called by the CPeriodic in order to draw the graphics 
// ---------------------------------------------------------
//
TInt CTextureContainer::DrawCallBack( TAny* aInstance )
{
    CTextureContainer* instance = (CTextureContainer*) aInstance;
    if ( instance->iTexture->GetState() == CTexture::ERunning )
                {
            /* Check if the textures are loaded before doing any rendering. */
            instance->iFrame++;
            
            /* Call the main OpenGL ES Symbian rendering 'loop' */
            instance->iTexture->AppCycle( instance->iFrame );
    
            /* Call eglSwapBuffers, which blit the graphics to the window */
            eglSwapBuffers( instance->iEglDisplay, instance->iEglSurface );
            
            /* To keep the background light on */
            if(!(instance->iFrame%100))  User::ResetInactivityTime();
            
            /* Suspend the current thread for a short while. Give some time 
               to other threads and AOs, avoids the ViewSrv error in ARMI and
               THUMB release builds. One may try to decrease the callback 
               function instead of this. */ 
            if(!(instance->iFrame%50))   User::After(0);
                }
    return 0; 
}

// ---------------------------------------------------------
// CTextureContainer::HandleControlEventL(
//     CCoeControl* aControl,TCoeEvent aEventType)
// ---------------------------------------------------------
//
void CTextureContainer::HandleControlEventL(
    CCoeControl* /*aControl*/,TCoeEvent /*aEventType*/)
{
}

// End of File  

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© Nokia 2006